Foroud et al. [14] strengthened the association of the CDKN2BAS locus at 9p21.3 with IA in a European population, and a follow-up of this GWAS in a larger dataset of white ancestry [15] detected a novel association of rs10230207 near HDAC9 (histone deacetylase 9), a gene previously associated with ischemic stroke [16–17]. The gene discussed is HDAC9; the disease is ischemic stroke.